BACKGROUND: A novel bi-exponential method has emerged to estimate critical speed (CS) and D-prime (D') from a 3-min all-out test (3MT). OBJECTIVES: To compare CS analysis methods to determine whether parameter estimations were interchangeable. Reference values and relationships with key soccer matchplay variables were explored. METHODS: Thirteen elite male youth (14-15 years old) players completed a 30 m shuttle run 3MT to estimate CS, D', rate of speed decline time constant, maximal speed (Smax), time to Smax (tmax), and fatigue index (FI), using the traditional method and bi-exponential model on average (Bi-ExpAverage) and max speed settings (Bi-ExpMax-Speed). High-speed running (HSR) and sprinting distances and counts, and the number of accelerations were collected from two matches. Magnitude-based inferences (p < 0.05) with smallest worthwhile change of 0.2 effect sizes were used to analyse differences. Pearson's and Spearman's correlation coefficients were used to measure associations between CS model variables and match-play parameters. RESULTS: There were significant differences between the traditional method and both bi-exponential models for CS and D' , as well as between the bi-exponential models for all variables except tmax. Using the Bi-ExpAverage model, strong correlations (r = 0.70-0.73; p < 0.05) were observed for D' and FI with the number of standardised and individualised HSRs, respectively. With the Bi-ExpMax-Speed model, there were strong correlations (r/ρ = 0.64-0.68; p < 0.05) between D' and the number of standardised HSRs and sprints, and the number of individualised sprints. CONCLUSION: There is a lack of interchangeability between analysis methods. It appears that D' and FI from the bi-exponential models could be associated with high-intensity actions in soccer match-play.

ABSTRACT Objective To describe the prevalence of noncommunicable disease (NCD) risk factors and assess knowledge of those risk factors in the indigenous community of Santiago Atitlán in Guatemala, a lower-middle income country. Methods A population-based, cross-sectional study was conducted using a modified version of the World Health Organization’s STEPS protocol. Adults aged 20–65 years were surveyed regarding demographics and NCD risk factors, and the survey was followed by anthropometric and biochemical measurements. Results Out of 501 screened individuals, 350 respondents were enrolled. The mean age was 36.7 years, and 72.3% were women. Over 90% reported earning less than US$ 65 per month. Almost 80% were stunted. Among women, 37.3% were obese and over three-quarters had central obesity. Over three-quarters of the entire group had dyslipidemia and 18.3% had hypertension, but only 3.0% had diabetes. Overall, 36.0% of participants met criteria for metabolic syndrome. There was no significant association between participants’ education and NCD risk factors except for an inverse association with obesity by percent body fat. Conclusions Santiago Atitlán is a rural, indigenous Guatemalan community with high rates of poverty and stunting coexisting alongside high rates of obesity, particularly among women. Additionally, high rates of hypertension and dyslipidemia were found, but a low rate of diabetes mellitus. Knowledge of NCDs and their risk factors was low, suggesting that educational interventions may be a high-yield, low-cost approach to combating NCDs in this community.

RESUMEN Objetivo Describir la prevalencia de los factores de riesgo de las enfermedades no transmisibles (ENT) y evaluar el conocimiento de esos factores de riesgo en la comunidad indígena de Santiago Atitlán en Guatemala, un país de ingresos medianos bajos. Métodos Se realizó un estudio transversal basado en la población usando una versión modificada del protocolo STEPS de mediciones físicas de la Organización Mundial de la Salud. Se realizó una encuesta a adultos de 20 a 65 años de edad con respecto a algunas características demográficas y los factores de riesgo de las ENT; la encuesta fue seguida de mediciones antropométricas y bioquímicas. Resultados De las 501 personas encuestadas, se registraron 350 para el sondeo. La media de edad fue 36,7 años, y 72,3% eran mujeres. Más de 90% informó tener un ingreso inferior a los US$ 65 mensuales. Casi 80% padecía retraso del crecimiento. Entre las mujeres, 37,3% eran obesas y más de tres cuartas partes tenían obesidad central. Más de tres cuartas partes del grupo tenían dislipidemia y 18,3% tenían hipertensión, pero solo 3,0% tenía diabetes. En términos generales, 36,0% de los participantes satisfacía los criterios de síndrome metabólico. No se observó una asociación significativa entre el nivel de escolaridad de los participantes y los factores de riesgo de las ENT, excepto una asociación inversa con la obesidad por porcentaje de tejidos grasos. Conclusiones Santiago Atitlán es una comunidad indígena rural de Guatemala con tasas elevadas de pobreza y retraso del crecimiento, que coexisten con tasas altas de obesidad, en particular en las mujeres. Además, se encontraron tasas elevadas de hipertensión y dislipidemia, pero una tasa baja de diabetes mellitus. Se observó un conocimiento bajo de las ENT y sus factores de riesgo, lo que indica que las intervenciones educativas pueden ser un enfoque de alto rendimiento y bajo costo para combatir las ENT en esta comunidad.

A geração de potencial em bioânodos de Pseudomonas aeruginosa a partir da bio transformação de glicerol, foi acoplada à captura de dióxido de carbono em biocátodos de Chlorella vulgaris em uma célula a combustível híbrida fotossintética (HPSBC). Parâmetros bioquímicos tais como crescimento microbiano, consumo de substrato, produção de pigmentos bacterianos e a captura de CO2 foram estudados. Igualmente, parâmetros eletroquímicos de densidades de correntes máximas (Id max), geração de densidade potencia máxima (Pd max) e eficiências coulômbicas (C E), foram estudados. Inicialmente, ambos os sistemas foram avaliados em separado contra os correspondentes pares redox Fe3+|Fe2+. No sistema bacteriano, resultados importantes em termos de Id max de 42 ± 2,1 µA cm-2, C E de 48 ± 2,4% e Pd max de 350 ± 17,5 mW cm-2 foram alcançados. Igualmente, para o sistema catódico algal isolado, valores de Id max de 93 ± 4,65 µA cm-2, C E de 56 ± 2,8% e Pd max de 3,2 ± 0,16 mW cm-2, foram atingidos. Em contraste, quando os dois sistemas foram acoplados, um valor menor de Id max de 48,5 ± 2,42 µA cm-2 foi observado. Finalmente, as condições bioeletroquímicas foram melhoradas com base no consumo de substrato, a geração de produtos eletrogênicos, o transporte de cátions e os sistemas para transporte de elétrons empregados. Assim, maiores valores médios para Id max de 80 ± 4,0 µA cm-2, para C E de 71,5 ± 3,57% e para Pd max de 650 ± 32,5 mW cm-2 foram obtidos.

Power generation at bioanodes of Pseudomonas aeruginosa for glycerol biotransformation was coupled to the carbon dioxide capture in biocathodes of Chlorella vulgaris in hybrid photosynthetic biofuel cells (HPSBC). Biochemical parameters such as microbial growth, substrate consumption, production of bacterial pigments and CO2 capture were studied. Also electrochemical parameters of maxima current densities (Id max), power output (Pd max) and coulombic efficiencies (C E) were studied. Initially, both systems were evaluated in separate against the corresponding Fe3+|Fe2+ redox pair. In bacterial systems, important results in terms of Id max of 42 ± 2.1 µA cm-2, C E of 48 ± 2.4% and Pd max of 350 ± 17.5 mW cm-2 were achieved. Likewise, for isolated algal cathode systems, Id max of 93 ± 4.65 µA cm-2, C E of 56 ± 2.8% and Pd max of 3.2 ± 0.16 mW cm-2, were achieved. In contrast, when both systems were coupled, a lower Id max of 48.5 ± 2.42 µA cm-2 was observed. Finally, bioelectrochemical conditions were improved based on substrate consumption, electrogenic products, cation transport and mediated electron transfer systems. Thus, higher average values for Id max of 80 ± 4.0 µA cm-2, C E of 71.5 ± 3.57% and Pd max of 650 ± 32.5 mW cm-2 were obtained.

Background. In 1997, the Clinic for Nephrotic Syndrome was established at the Hospital de Pediatría, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social (Mexico City); 30-50% of children with steroid-resistant nephrotic syndrome develop chronic renal failure and 60-80% achieve remission with cyclosporine. The objective of the study was to report treatment response and prognosis using the described scheme in a group of patients with steroid-resistant nephrotic syndrome. Methods. Retrospective study in children with steroid-resistant nephrotic syndrome was done. Remission frequency and renal survival were measured. Results. One-hundred fifty seven patients were studied; 66.7% were male. Mean age at diagnosis was 5.9 ± 4.2 years. Biopsies showed 33 results (21.9%) with minimal changes (MC), 74 (49%) with diffuse mesangial proliferation (DMP) and 44 (29.1%) with focal segmental glomerulosclerosis (FSGS). Mean follow-up time was 59.3 months (minimum 3 months, maximum 178 months); 59% were on cyclosporine and 17.3% cyclophosphamide. Twenty six patients received both treatments and six patients received all three medications; 78.2% entered remission, 5.8% were on dialysis and 1.9% died. Five-year renal survival was 92.9% and 10-year survival was 80%. Remission in patients with MC and DMP was 79.8% and 86.5%, respectively and in FSGS was 59.1%. Chronic renal failure was found more often in FSGS (20.4%). Risk of developing renal failure with FSGS compared with DMP was 4.7 times and FSGS compared with MC risk was 8.7 times greater. Conclusions. Similar rates of remission and better renal survival were found compared with the literature.

Introducción. Desde 1997 se estableció la clínica de síndrome nefrótico en el Hospital de Pediatría del Centro Médico Nacional Siglo XXI. Del 30 al 50% de los niños con síndrome nefrótico corticorresistente evolucionan a insuficiencia renal crónica, y 60-85% remiten con ciclosporina. El objetivo de este estudio fue reportar la respuesta al tratamiento y el pronóstico con este esquema en un grupo de pacientes con síndrome nefrótico corticorresistente. Métodos. Se realizó un estudio retrospectivo, longitudinal en niños con síndrome nefrótico corticorresistente. Se determinaron los resultados de la remisión y la supervivencia renal. Resultados. Se incluyeron 156 pacientes. El 66.7% de sexo masculino, la edad media al diagnóstico fue de 5.9 ± 4.2 años. La biopsia inicial resultó con cambios mínimos en 33 pacientes (21.9%), proliferación mesangial difusa en 74 (49%) y glomeruloesclerosis focal y segmentaria en 44 (29.1%). El promedio de seguimiento fue de 59.3 meses (mín 3 y máx 178 meses). Recibieron ciclosporina 59%; ciclofosfamida, 17.3% y 26 pacientes recibieron secuencialmente ambos esquemas. Remitieron 78.2% de ellos, requirieron diálisis 5.8% y fallecieron 1.9%. La supervivencia renal a 5 años fue de 92.9% y a 10 años, de 80%. La remisión en cambios mínimos y proliferación mesangial difusa fue de 79.8% y 86.5%, respectivamente y en glomeruloesclerosis focal y segmentaria 59.1%. La insuficiencia renal fue más frecuente en glomeruloesclerosis focal y segmentaria (20.4%). El riesgo de desarrollar insuficiencia renal con glomeruloesclerosis focal comparado con proliferación mesangial difusa fue 4.7 veces mayor, y comparado con cambios mínimos, el riesgo fue 8.72 veces mayor. Conclusiones. En este estudio se encontró remisión similar y frecuencia de progresión a insuficiencia renal mejor a lo que se ha reportado en la literatura.

RESUMEN Se analiza la síntesis, caracterización y las propiedades electroquímicas de diferentes electrodos para baterías de ion litio, identificándose los precursores y los métodos de síntesis, resaltando los procesos de los materiales obtenidos en Bolivia, y las propiedades comerciales ofertadas para estos materiales por diferentes empresas. Finalmente se hace la identificación de los procesos de obtención para dos electrodos catódicos (LiMn2O4) y del (LiFePO4), a partir de potenciales precursores existentes en Bolivia.

ABSTRACT The existing aspects about synthesis, characterization and electrochemical properties of different electrodes for lithium ion batteries are analyzed. Identification and synthesis of precursors are included and also the processes of these materials obtaining in Bolivia. The commercial properties for these materials offered by different companies are mentioned. Finally local synthesis of two cathode electrodes (LiMn2O4) and (LiFePO4) from potential precursors present in Bolivia are reported.

El estudio se efectuó con el objetivo de evaluar el estado nutricional de pacientes onco-hematológicos en un hospital de referencia del sistema de seguridad social. Fue un estudio observacional, descriptivo y transversal en 150 pacientes hospitalizados en los servicios de Oncología y Hematología del Hospital Materno Infantil de la Caja Nacional de Salud. La evaluación del estado nutricional se realizó mediante la escala de Valoración Global Subjetiva además de la determinación del IMC. La descripción se realizó por medio de frecuencias, porcentajes totales, medias, medianas y desviación estándar, las frecuencias de asociación fueron analizadas con la prueba del Chi cuadrado (X²). El 30 % de pacientes fue clasificado como "malnutrición grave", el 52.7% como "con riesgo de malnutrición" y el 17.3% de los pacientes como con buen estado nutricional. Los pacientes con cáncer hospitalizados en el Hospital Materno Infantil presentan una elevada frecuencia de "riesgo de malnutrición" y "malnutrición grave". La escala de Valoración Subjetiva Global, es un método válido de evaluación nutricional inicial; es sensible, específico y sencillo de realizar.

The study was performed in order to evaluate the nutritional status of onco-haematological patients at a referral hospital of the social security system. It was a observational, descriptive and cross-sectional in 150 patients hospitalized in the Oncology and Hematology departments, in the Materno Infantil Hospital of the Caja Nacional de Salud. The evaluation of nutritional status was performed by the Subjective Global Assessment Scale as well as determination of IMC. The description was carried out by means offrequency, total percentages, averages, median and standard deviation; the frequencies of association were analyzed using the Chi square test (X²); 30% of patients were classified as "severe malnutrition", 52.7% as "with malnutrition risk" and 17.3% as "with good nutritional condition". Cancer patients hospitalized at the Materno Infantil Hospital have high frequency of "malnutrition risk" and "severe malnutrition." The Subjective Global Assessment Scale is a valid method of initial nutritional evaluation; it is sensitive, specific and easy to carry out.

Introduction. We define cor triatriatum sinistrum as an anomalous fibromuscular membrane in the left atrium which divides it into 2 cavities with variable degrees of obstruction. Material and methods. In this retrospective, longitudinal and descriptive study we show a series of ten patients treated at the Hospital Infantil de Mexico in a 26 year-experience diagnosed by echocardiography. Results. No additional studies were necessary. Median age was 16.9 months; sex distribution was 1:1, registering mortality in 2 patients (20%). Long-term follow-up in 8 remaining patients had a mean of 46.8 months. Echocardiography is diagnostic and identifies associated congenital cardiac anomalies; right atriotomy approach provides excellent exposure and allows resection of the obstructive membrane. It also allows resolution of associated defects and is the preferential approach. Conclusion. This is the largest pediatric series reported to date in our country.

Introducción. El cor triatriatum sinistrum es una membrana fibromuscular anómala en aurícula izquierda que la divide en 2 cavidades, con grados variables de obstrucción. Material y métodos. Estudio retrospectivo, longitudinal y descriptivo, que muestra 10 pacientes tratados en el Hospital Infantil de México Federico Gómez en 26 años, diagnosticados con ecocardiografía. Resultados. En ningún caso fue necesario realizar estudios adicionales ya que la ecocardiografía fue definitiva en el diagnóstico. La media de edad fue 16.9 meses; distribución por sexos 1:1. Dos pacientes murieron. El seguimiento a largo plazo promedió 46.8 meses en los 8 pacientes restantes. Conclusión. La ecocardiografía fue diagnóstica e identificó anomalías cardiacas congénitas asociadas. El abordaje por atriotomía derecha permitió una excelente exposición, la resección de la membrana obstructiva y la resolución de defectos asociados, demostrando ser la medida terapéutica definitiva. Esta es la serie pediátrica más grande reportada en nuestro país a la fecha.